1793     int old_flags = *const_cast<volatile int *>(&_flags);

  1793     // Only record if it's not already set.

  1794     while ((old_flags & _on_stack) == 0) {

  1794     if (!on_stack()) {

  1795       int new_flags = old_flags | _on_stack;

  1795       _flags |= _on_stack;

  1796       int result = Atomic::cmpxchg(new_flags, &_flags, old_flags);

  1796       MetadataOnStackMark::record(this);

  1797 

  1798       if (result == old_flags) {

  1799         // Succeeded.

  1800         MetadataOnStackMark::record(this, Thread::current());

  1801         return;

  1802       }

  1803       old_flags = result;